JP5094910B2 - Mobile communication system and mobile station - Google Patents

Description

  The present invention relates to a mobile communication system, a radio access network apparatus, and a mobile station.

  In 3GPP, as a function of “SON (Self Configuration and Self Organization)”, it is considered to exchange load information (Resource Status) in each cell between different RATs (Radio Access Technology).

  For example, it is considered that load information in each cell is exchanged between E-UTRAN (Evolved Universal Terrestrial Radio Access Network) and UTRAN (Universal Terrestrial Radio Access Network).

  Here, in order to distribute the load, the radio base station eNB in the E-UTRAN (or the radio network controller RNC in the UTRAN) selects the mobile station UE in the subordinate cell based on the load information. It is possible to transition to a cell (or an E-UTRAN cell).

3GPP TS 25.331, “Radio Resource Control (RRC); Protocol specification” 3GPP TS 25.413, “UTRAN Iu interface Radio Access Network Application Part (RANAP) signaling” 3GPP TS36.331 “Radio Resource Control (RRC); Protocol specification” 3GPP TS 36.413, “Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 application protocol (S1AP)” 3GPP TS 48.018, “General Packet Radio Service (GPRS); Base Station System (BSS) —Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)”

  Here, in the mobile communication system described above, when the mobile station UE is instructed by the radio network controller RNC to transition to E-UTRAN, the mobile station UE has the highest radio quality at the frequency specified by the radio network controller RNC. Is selected, and the broadcast information in the selected cell is acquired.

  The radio network controller RNC can also instruct the mobile station UE of blacklisted cells that are prohibited from accessing at such frequencies.

  However, the black list cell is information managed by E-UTRAN, and uses a network management system (O & M: Operation and Management system) used by a telecommunications carrier or statically, a radio network controller. There was a problem that a blacklist cell had to be set in the RNC.

  Therefore, the present invention has been made in view of the above-described problems, and conforms to the functions (TS25.413, TS36.413, TS48.018, etc.) defined in the 3GPP specifications in the radio network controller RNC. It is an object of the present invention to provide a mobile communication system, a radio access network apparatus, and a mobile station that can acquire a black cell list managed by E-UTRAN by the above method.

  A first feature of the present invention is a mobile communication system including a first radio access network and a second radio access network, wherein the radio access network apparatus in the first radio access network is the second radio access network. And a physical cell ID of a blacklist cell, which is a cell for which access is prohibited in the downlink carrier, to a wireless access network device in the network To do.

  According to a second aspect of the present invention, there is provided a radio access network apparatus in the first radio access network, the frequency of the downlink carrier and the downlink carrier for the radio access network apparatus in the second radio access network. The gist is that the physical cell ID of a black list cell that is a cell for which access is prohibited is transmitted.

  A third feature of the present invention is a mobile station used in a mobile communication system including a first radio access network and a second radio access network, from the radio access network apparatus in the second radio access network, A receiving unit configured to receive an instruction signal instructing to transition to a cell in the first radio access network, and the instruction signal at a frequency of a downlink carrier included in the received instruction signal; And a cell selection unit configured not to select the black list cell specified by the physical cell ID included in the cell.

  As described above, according to the present invention, at the radio network controller RNC, the mobile station UE is instructed to make a transition to E-UTRAN, and at the same time, the functions defined in the 3GPP specifications (TS25.413 and TS36). .413, TS48.018, etc.), a mobile communication system, a radio access network apparatus, and a mobile station that can acquire a black cell list managed by E-UTRAN can be provided.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a protocol stack diagram of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. 3 is a flowchart showing an operation of the mobile station according to the first embodiment of the present invention.

(Mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIG. 1 to FIG.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes an E-UTRAN, a mobile network that accommodates E-UTRAN, a UTRAN, and a core network that accommodates UTRAN.

  A radio base station eNB is arranged in the E-UTRAN, a mobility management node MME is arranged in the mobile network, and a radio base station NodeB and a radio network controller RNC are arranged in the UTRAN. In the core network, a packet switch SGSN is arranged.

  In the example of FIG. 1, the E-UTRAN cell # 1 under the radio base station eNB and the UTRAN cell # 2 under the radio base station NodeB (radio network control station RNC) are arranged so as to be geographically superimposed.

  FIG. 2 shows a protocol stack diagram of the mobile communication system according to the present embodiment.

  As shown in FIG. 2, the radio base station eNB has, as protocol functions, an NWL1 (Network Layer 1) function, an NWL2 (Network Layer 2) function, an IP (Internet Protocol) layer function, and an SCTP (Stream Control Transmission Protocol). ) Layer function, S1-AP (S1 Application) layer function, RIM (RAN Information Transfer) layer function, and SON Transfer layer function.

  Further, the mobility management node MME has, as a protocol function, an NWL1 function, an NWL2 function, an IP layer function, an SCTP layer function, and an S1-AP layer function on the radio base station eNB side, and a packet switch SGSN. The NWL1 function, the NWL2 function, the IP layer function, the SCTP layer function, and the GTP (GPRS Tunneling Protocol) v2-C layer function are provided, and the RIM layer function and the SON Transfer layer function are further provided. It has.

  Further, the packet switch SGSN has, as a protocol function, an NWL1 function, an NWL2 function, an IP layer function, an SCTP layer function, and a GTPv2-C layer function on the mobility management node MME side. On the RNC side, NWL1 function, NWL2 function, IP layer function, SCTP layer function, and RANAP (Radio Access Network Application Part) layer function are provided, and further RIM layer function and SON Transfer layer function are provided. It has.

  Further, the radio network controller RNC has NWL1 function, NWL2 function, IP layer function, SCTP layer function, RANAP layer function, RIM layer function, and SON Transfer layer function as protocol functions. Yes.

  As shown in FIG. 3, as defined in 3GPP TS36.413, when the radio base station eNB receives “SON Transfer Request” from the radio network controller RNC, It is configured to transmit “SON Transfer Response”.

  Here, the radio base station eNB uses the “SON Transfer Response” to transmit the frequency of the downlink carrier to the radio network controller RNC (DL Carrier Frequency, EARFCN: E-UTRA Absolute Radio Frequency Number) and downlink. It is configured to transmit a physical cell ID (PCI: Physical Cell ID) of a blacklisted cell that is a cell for which access is prohibited at the carrier frequency.

  In addition, when a plurality of downlink carriers are used in E-UTRAN, “SON Transfer Request” is the same as the number of downlink carriers used between the radio base station eNB and the radio network controller RNC. And “SON Transfer Response” are exchanged.

  As shown in FIG. 4, the mobile station UE includes a receiving unit 11 and a cell selection processing unit 12.

  The receiving unit 11 is configured to receive an instruction signal for instructing a transition to an E-UTRAN cell from a radio network controller RNC in the UTRAN when the mobile station UE is located in the UTRAN. Has been.

  For example, the reception unit 11 transmits, as the instruction signal, a signal “RRC Connection Release” requesting to release an RRC connection established by the mobile station UE in UTRAN, or the UTRAN transmitted to the UTRAN by the mobile station UE. It is configured to receive a signal “RRC Connection Reject” or the like that rejects the “RRC Connection Request”.

  Note that the receiving unit 11 receives an instruction signal instructing to make a transition to the UTRAN cell from the radio base station eNB in the E-UTRAN when the mobile station UE is located in the E-UTRAN. It may be configured as follows.

  The cell selection processing unit 12 makes a transition to E-UTRAN (or UTRAN) according to the instruction signal received by the receiving unit 11, and has the highest radio quality at the frequency of the downlink carrier included in the instruction signal. It is configured to select a good cell.

  Here, the cell selection processing unit 12 is configured not to select the blacklist cell specified by the physical cell ID included in the instruction signal at the frequency of the downlink carrier included in the received instruction signal. Has been.

  Hereinafter, with reference to FIG.5 and FIG.6, the operation | movement which the mobile station UE changes from UTRAN to E-UTRAN in the mobile communication system which concerns on this embodiment is demonstrated.

  As shown in FIG. 5, in step S1001, the radio network controller RNC transmits, to the mobile station UE, “RRC Connection Release” or “RRC Connection Release (PCI)” including “DL Carrier Frequency (EARFCN)” and “Blacklisted cells (PCI)”. RRC Connection Reject ”is transmitted.

  In step S1002, the mobile station UE performs the operation shown in FIG.

  Specifically, as illustrated in FIG. 6, the mobile station UE scans the above-mentioned “DL Carrier Frequency (EARFCN)” in step S101, and in step S102, the “Blacklisted cells” A cell having the best radio quality other than the cell specified by (PCI) is selected.

  In step S103, the mobile station UE receives broadcast information in the selected cell, for example, a MIB (Master Information Block) or an SIB (System Information Block).

  Here, if the mobile station UE determines that access is restricted in the selected cell based on the restriction information in the received broadcast information, the mobile station UE returns to step S102 and tries to select another cell.

  In step S103, when the mobile station UE determines that access is not restricted in the selected cell based on the restriction information in the received broadcast information, the mobile station UE starts an RA (Random Access) procedure in the cell.

  According to the mobile communication system according to the present embodiment, the mobile station UE can grasp the blacklist cell at the transition destination frequency from the instruction signal from the radio network controller RNC (or radio base station eNB). Therefore, it is possible to avoid selecting the blacklist cell at the transition destination frequency, and it is possible to complete the transition to E-UTRAN (or UTRAN) quickly.

  The characteristics of the present embodiment described above may be expressed as follows.

  A first feature of the present embodiment is a mobile communication system including an E-UTRAN (first radio access network) and a UTRAN (second radio access network), and a radio base station eNB (first radio access station) in the E-UTRAN. The radio access network device in one radio access network) has a downlink carrier frequency (EARFCN) and a downlink carrier for a radio network controller RNC (radio access network device in the second radio access network) in UTRAN. The gist of the present invention is to transmit a physical cell ID (PCI) of a blacklisted cell, which is a cell that is prohibited from being accessed at a certain frequency.

  In the first feature of the present embodiment, the radio network controller RNC transmits, in the instruction signal instructing the mobile station UE to transition to the E-UTRAN cell (cell in the first radio access network). The mobile station UE is configured to notify the link carrier frequency and the physical cell ID of the black list cell in the downlink carrier, and the mobile station UE selects the black list cell specified by the physical cell ID in the downlink carrier frequency. It may be configured not to.

  The second feature of the present embodiment is a radio base station eNB in E-UTRAN, and access to the radio network controller RNC in UTRAN is prohibited at the frequency of the downlink carrier and the frequency of the downlink carrier. The gist is that it is configured to transmit the physical cell ID of a blacklist cell, which is a cell that has been set.

  A third feature of the present embodiment is a mobile station UE used in a mobile communication system equipped with E-UTRAN and UTRAN so that the radio network controller RNC in the UTRAN transitions to the E-UTRAN cell. A receiving unit 11 configured to receive an instruction signal to instruct, and a black specified by a physical cell ID included in the instruction signal at a frequency of a downlink carrier included in the received instruction signal The gist of the present invention is to include a cell selection unit 12 configured not to select a list cell.

  In the first and third features of the present embodiment, the instruction signal described above may be a signal “RRC Connection Release” requesting to release an RRC connection established by the mobile station UE in UTRAN.

  In the first and third features of the present embodiment, the instruction signal is a signal “RRC Connection Reject” that rejects “RRC Connection Request (connection setting request)” transmitted by the mobile station UE to the UTRAN. There may be.

  The operations of the mobile station UE, the radio base station eNB / NodeB, the radio network controller RNC, the mobility management node MME, and the packet switch SGSN described above may be implemented by hardware, or a software module that is executed by a processor. Or may be implemented by a combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a Hard Disk, a Registered ROM, a Hard Disk Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE, the radio base station eNB / NodeB, the radio network controller RNC, the mobility management node MME, or the packet switch SGSN. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE, the radio base station eNB / NodeB, the radio network controller RNC, the mobility management node MME, or the packet switch SGSN.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station 11 ... receiving unit 12 ... cell selection unit eNB, NodeB ... radio base station RNC ... radio network controller MME ... mobility management node SGSN ... packet switch

Claims (4)

A mobile communication system comprising a first radio access network and a second radio access network,
The radio access network apparatus in the first radio access network is prohibited from accessing the radio access network apparatus in the second radio access network at a downlink carrier frequency and a downlink carrier frequency. Is configured to transmit the physical cell ID of the blacklist cell ,
The radio access network apparatus in the second radio access network uses a frequency of the downlink carrier and the downlink in an instruction signal that instructs a mobile station to transition to a cell in the first radio access network. Configured to notify a physical cell ID of the blacklist cell in a carrier;
The mobile station is configured not to select a blacklist cell specified by the physical cell ID in the frequency of the downlink carrier,
The mobile communication system , wherein the instruction signal is a signal requesting to release a connection established by the mobile station in the second radio access network .   A mobile communication system comprising a first radio access network and a second radio access network,
  The radio access network apparatus in the first radio access network is prohibited from accessing the radio access network apparatus in the second radio access network at a downlink carrier frequency and a downlink carrier frequency. Is configured to transmit the physical cell ID of the blacklist cell,
  The radio access network apparatus in the second radio access network uses a frequency of the downlink carrier and the downlink in an instruction signal that instructs a mobile station to transition to a cell in the first radio access network. Configured to notify a physical cell ID of the blacklist cell in a carrier;
  The mobile station is configured not to select a blacklist cell specified by the physical cell ID in the frequency of the downlink carrier,
The mobile communication system, wherein the instruction signal is a signal for rejecting a connection setting request transmitted by the mobile station to the second radio access network. A mobile station used in a mobile communication system comprising a first radio access network and a second radio access network,
A receiving unit configured to receive an instruction signal for instructing a transition to a cell in the first radio access network from a radio access network device in the second radio access network;
A cell selection unit configured not to select a blacklist cell specified by a physical cell ID included in the instruction signal at a frequency of a downlink carrier included in the received instruction signal. and,
The mobile station characterized in that the instruction signal is a signal requesting to release a connection established by the mobile station in the second radio access network . A mobile station used in a mobile communication system comprising a first radio access network and a second radio access network,
  A receiving unit configured to receive an instruction signal for instructing a transition to a cell in the first radio access network from a radio access network device in the second radio access network;
  A cell selection unit configured not to select a blacklist cell specified by a physical cell ID included in the instruction signal at a frequency of a downlink carrier included in the received instruction signal;
Comprising
  The mobile station, wherein the instruction signal is a signal for rejecting a connection setting request transmitted by the mobile station to the second radio access network.

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